OK, the one ktfoley posted is known commonly as Moosewood's Six Minute Vegan Chocolate cake.
There's Moosewood Perfect Chocolate Cake that is likely not what you're looking for (has cup of butter):
https://recipes.sparkpeople...But here are 3 other possible low calorie choc cakes (good in their own ways):
1) with sauerkraut
weightwatchers.ca/food/rcp/recipepage.aspx?Recipeid=127161
2) with banans (vegan adaptation of the sauerkraut one)
egglesscooking.com/2010/01/06/vegan-chocolate-banana-cake/
3) with black beans
http://www.cookingchanneltv...